#pragma once
#include "../common/net.hpp"
#include "../common/message.hpp"
#include <future>
#include <functional>

namespace rpc {
    namespace client {
        class Requestor {
        public:
            using ptr = std::shared_ptr<Requestor>;
            using RequestCallback = std::function<void(const BaseMessage::ptr&)>;
            using AsyncResponse = std::future<BaseMessage::ptr>;

            struct RequestDescribe {
                using ptr = std::shared_ptr<RequestDescribe>;
                BaseMessage::ptr request;
                RType rtype;
                std::promise<BaseMessage::ptr> response;
                RequestCallback callback;
            };

            void onResponse(const BaseConnection::ptr& conn, BaseMessage::ptr& msg) {
                std::string rid = msg->rid();
                RequestDescribe::ptr rdp = getDescribe(rid);
                if(rdp.get() == nullptr) {
                    // ELOG("收到响应 - %s, 但是未找到对应的请求描述!", rid.c_str());
                    return;
                }
                if(rdp->rtype == RType::REQ_ASYNC) {
                    rdp->response.set_value(msg);
                }
                else if(rdp->rtype == RType::REQ_CALLBACK) {
                    if(rdp->callback)
                        rdp->callback(msg);
                }
                else {
                    // ELOG("请求类型未知！！");
                }
                delDescribe(rid);
            }

            bool send(const BaseConnection::ptr& conn, const BaseMessage::ptr& req, AsyncResponse& async_rsp) {
                RequestDescribe::ptr rdp = newDescribe(req, RType::REQ_ASYNC);
                if(rdp.get() == nullptr) {
                    // ELOG("构造请求描述对象失败!");
                    return false;
                }
                conn->send(req);
                async_rsp = rdp->response.get_future();
                return true;
            }

            bool send(const BaseConnection::ptr& conn, const BaseMessage::ptr& req, BaseMessage::ptr& rsp) {
                AsyncResponse rsp_future;
                bool ret = send(conn, req, rsp_future);
                if(ret == false) {
                    return false;
                }
                rsp = rsp_future.get();
                return true;
            }
            
            bool send(const BaseConnection::ptr& conn, const BaseMessage::ptr& req, const RequestCallback& cb) {
                RequestDescribe::ptr rdp = newDescribe(req, RType::REQ_CALLBACK, cb);
                if(rdp.get() == nullptr) {
                    // ELOG("构造请求描述对象失败!");
                    return false;
                }
                conn->send(req);
                return true;
            }
        private:
            RequestDescribe::ptr newDescribe(const BaseMessage::ptr& req, RType rtype, const RequestCallback& cb = RequestCallback()) {
                std::unique_lock<std::mutex> lock(_mutex);
                RequestDescribe::ptr rd = std::make_shared<RequestDescribe>();
                rd->request = req;
                rd->rtype = rtype;
                if(rtype == RType::REQ_CALLBACK && cb) {
                    rd->callback = cb;
                }
                _request_desc.insert(std::make_pair(req->rid(), rd));
                return rd;
            }

            RequestDescribe::ptr getDescribe(const std::string& rid) {
                std::unique_lock<std::mutex> lock(_mutex);
                auto it = _request_desc.find(rid);
                if(it == _request_desc.end()) {
                    return RequestDescribe::ptr();
                }
                return it->second;
            }

            void delDescribe(const std::string& rid) {
                std::unique_lock<std::mutex> lock(_mutex);
                _request_desc.erase(rid);
            }
        private:
            std::mutex _mutex;
            std::unordered_map<std::string, RequestDescribe::ptr> _request_desc;
        };
    }
}